Medical Dictionary
methacholine
noun metha·cho·line \ˌmeth-ə-ˈkō-ˌlēn\
Medical Definition of METHACHOLINE
: a parasympathomimetic drug administered in the form of its crystalline chloride C8H18ClNO2 especially to diagnose hypersensitivity of the bronchial air passages (as in asthma)—see mecholyl, provocholine
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